code: def get_slots(self, idx):
      return copy.deepcopy(self.slots[idx])
  
file_path: dgl/examples/pytorch/jtnn/jtnn/mol_tree.py
imports: import copy
  import rdkit.Chem
label_desc: Use image node_id 4 for calling the Vocab obj's underlying member method code with example usage: obj.get_slots(idx) and returns: copy